<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style >
		body{
			margin: 0;
		}
			.root-div{
				font-size: 0;
			}
			.root-div>div{
				display: inline-block;
				padding: 10%;
			}
			.root-div1{
				background: #F2F2F2;
				position: relative;
			}
			.root-div>div:nth-child(2){
				background: #888;
			}
			.root-div>div:nth-child(3){
				background: #AAA;
			}
			.root-div>div:nth-child(4){
				background: #eee;
			}
			.root-div>div:nth-child(5){
				background: #ccc;
			}
		</style>
	</head>
	<body>
		<div class="root-div">
			<div class="root-div1">
				<div style="position: absolute;width: 100%;height: 100%;top: 0;left: 0;color: red;font-size: 16px;">
					12345
				</div>
			</div>
			<div></div>
			<div></div>
			<div></div>
			<div></div>
			<div></div>
		</div>
	</body>
</html>
